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Asian Journal of Plant Sciences
Year: 2009  |  Volume: 8  |  Issue: 2  |  Page No.: 102 - 110

Stability of Relationship Between Chlorophyll Density and Soil Plant Analysis Development Chlorophyll Meter Readings in Peanut Across Different Drought Stress Conditions

A. Arunyanark, S. Jogloy, N. Vorasoot, C. Akkasaeng, T. Kesmala and A. Patanothai    

Abstract: The objectives of this study were to examine the stability of SPAD (soil plant analysis development) chlorophyll meter reading (SCMR) and chlorophyll density, surrogate trait of drought tolerance in peanut (Arachis hypogaea L.) and their relationships in different leaf positions at different times under different drought stress conditions. Chlorophyll density and SCMR varied depending on water regimes, times of sampling and genotypes, but water regime x genotype interactions were not significant for chlorophyll density and SCMR. The correlation coefficients between chlorophyll density and SCMR were positive and significant across irrigation treatments (r = 0.76**, 0.94** and 0.96**) and each water regime, plant age and leaf position (r = 0.31 to 0.99**). Interestingly, chlorophyll density and SCMR at different water regimes were also correlated significantly, indicating the stability of their relationship in different water regime conditions. The result suggest that evaluation of chlorophyll density by SCMR can be carried out at any water regime conditions in the second or third-fully expanded leaves after 40 days of crop growth. This confers a large flexibility to application of SCMR in breeding program for drought tolerance.

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